code: def _sellSignal(self, price):
      buyOrders, sellOrders = self._getActiveOrders()
      self._cancelOrders(buyOrders)
  
      brk = self.getBroker()
      shares = brk.getShares(self.__instrument)
      if len(sellOrders) == 0 and shares > 0:
          self.info("Sell %s at %s" % (shares, price))
          self.limitOrder(self.__instrument, price, shares * -1)
  
file_path: pyalgotrade/samples/bccharts_example_2.py
imports: from pyalgotrade import bar
  from pyalgotrade import strategy
  from pyalgotrade import plotter
  from pyalgotrade.technical import vwap
  from pyalgotrade.barfeed import csvfeed
  from pyalgotrade.bitstamp import broker
  from pyalgotrade import broker
label_desc: Use image node_id 5 for calling the VWAPMomentum obj's underlying member method code with example usage: obj._sellSignal(price) without return types